1 files changed, 70 insertions, 0 deletions
diff --git a/third_party/rust/mio/src/macros.rs b/third_party/rust/mio/src/macros.rs
new file mode 100644
index 0000000000..f97f90911f
--- /dev/null
+++ b/third_party/rust/mio/src/macros.rs
@@ -0,0 +1,70 @@
+//! Macros to ease conditional code based on enabled features.
+
+// Depending on the features not all macros are used.
+#![allow(unused_macros)]
+
+/// The `os-poll` feature is enabled.
+macro_rules! cfg_os_poll {
+    ($($item:item)*) => {
+        $(
+            #[cfg(feature = "os-poll")]
+            #[cfg_attr(docsrs, doc(cfg(feature = "os-poll")))]
+            $item
+        )*
+    }
+}
+
+/// The `os-poll` feature is disabled.
+macro_rules! cfg_not_os_poll {
+    ($($item:item)*) => {
+        $(
+            #[cfg(not(feature = "os-poll"))]
+            $item
+        )*
+    }
+}
+
+/// The `os-ext` feature is enabled.
+macro_rules! cfg_os_ext {
+    ($($item:item)*) => {
+        $(
+            #[cfg(feature = "os-ext")]
+            #[cfg_attr(docsrs, doc(cfg(feature = "os-ext")))]
+            $item
+        )*
+    }
+}
+
+/// The `net` feature is enabled.
+macro_rules! cfg_net {
+    ($($item:item)*) => {
+        $(
+            #[cfg(feature = "net")]
+            #[cfg_attr(docsrs, doc(cfg(feature = "net")))]
+            $item
+        )*
+    }
+}
+
+/// One of the features enabled that needs `IoSource`. That is `net` or `os-ext`
+/// on Unix (for `pipe`).
+macro_rules! cfg_io_source {
+    ($($item:item)*) => {
+        $(
+            #[cfg(any(feature = "net", all(unix, feature = "os-ext")))]
+            #[cfg_attr(docsrs, doc(cfg(any(feature = "net", all(unix, feature = "os-ext")))))]
+            $item
+        )*
+    }
+}
+
+/// The `os-ext` feature is enabled, or one of the features that need `os-ext`.
+macro_rules! cfg_any_os_ext {
+    ($($item:item)*) => {
+        $(
+            #[cfg(any(feature = "os-ext", feature = "net"))]
+            #[cfg_attr(docsrs, doc(cfg(any(feature = "os-ext", feature = "net"))))]
+            $item
+        )*
+    }
+}